metalhead
May I offer a suggestion? Re-encode your mp3 files first using the exact EQ setting you like and then transfer the files to your player. I don't really trust the player to do a good job of adjusting the sound to my liking. You can also normalise the files (make the volume the same) too before transferring to your player.
I use dbPowerAmp which has a very simple to use interface and can process lots of files in different folders very quickly (
http://www.dbpoweramp.com)